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根据磨牙萌出阶段，对上颌腭板、摆锤式矫治器和头帽推磨牙远移进行三维有限元分析。

A three-dimensional finite element analysis of molar distalization with a palatal plate, pendulum, and headgear according to molar eruption stage.

作者信息

Kang Ju-Man, Park Jae Hyun, Bayome Mohamed, Oh Moonbee, Park Chong Ook, Kook Yoon-Ah, Mo Sung-Seo

机构信息

Department of Dentistry, Graduate School, The Catholic University of Korea, Seoul, Korea.

Postgraduate Orthodontic Program, Arizona School of Dentistry & Oral Health, A.T. Still University, Mesa, AZ, USA.; Graduate School of Dentistry, Kyung Hee University, Seoul, Korea.

出版信息

Korean J Orthod. 2016 Sep;46(5):290-300. doi: 10.4041/kjod.2016.46.5.290. Epub 2016 Sep 19.

DOI:10.4041/kjod.2016.46.5.290
PMID:27668192
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5033768/
Abstract

OBJECTIVE

This study aimed to (1) evaluate the effects of maxillary second and third molar eruption status on the distalization of first molars with a modified palatal anchorage plate (MPAP), and (2) compare the results to the outcomes of the use of a pendulum and that of a headgear using three-dimensional finite element analysis.

METHODS

Three eruption stages were established: an erupting second molar at the cervical one-third of the first molar root (Stage 1), a fully erupted second molar (Stage 2), and an erupting third molar at the cervical one-third of the second molar root (Stage 3). Retraction forces were applied via three anchorage appliance models: an MPAP with bracket and archwire, a bone-anchored pendulum appliance, and cervical-pull headgear.

RESULTS

An MPAP showed greater root movement of the first molar than crown movement, and this was more noticeable in Stages 2 and 3. With the other devices, the first molar showed distal tipping. Transversely, the first molar had mesial-out rotation with headgear and mesial-in rotation with the other devices. Vertically, the first molar was intruded with an MPAP, and extruded with the other appliances.

CONCLUSIONS

The second molar eruption stage had an effect on molar distalization, but the third molar follicle had no effect. The application of an MPAP may be an effective treatment option for maxillary molar distalization.

摘要

目的

本研究旨在（1）评估上颌第二和第三磨牙萌出状态对使用改良腭部锚固板（MPAP）远移第一磨牙的影响，以及（2）通过三维有限元分析将结果与使用摆式矫治器和头帽的结果进行比较。

方法

设定三个萌出阶段：第二磨牙在第一磨牙牙根颈三分之一处萌出（阶段1）、第二磨牙完全萌出（阶段2）、第三磨牙在第二磨牙牙根颈三分之一处萌出（阶段3）。通过三种锚固矫治器模型施加内收力：带托槽和弓丝的MPAP、骨锚固摆式矫治器和颈牵引头帽。

结果

MPAP显示第一磨牙牙根移动大于牙冠移动，在阶段2和阶段3中更明显。使用其他装置时，第一磨牙表现为远中倾斜。横向来看，第一磨牙在使用头帽时发生近中向外旋转，在使用其他装置时发生近中向内旋转。纵向来看，第一磨牙使用MPAP时发生压低，使用其他矫治器时发生伸长。

结论

第二磨牙萌出阶段对磨牙远移有影响，但第三磨牙牙囊无影响。应用MPAP可能是上颌磨牙远移的一种有效治疗选择。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f141/5033768/60730cf72a42/kjod-46-290-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f141/5033768/99ae42d1dd93/kjod-46-290-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f141/5033768/5f46b71aae50/kjod-46-290-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f141/5033768/0ead6a0a8ab7/kjod-46-290-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f141/5033768/617d326a1bba/kjod-46-290-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f141/5033768/1e85433a6e59/kjod-46-290-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f141/5033768/f4288a2a66a6/kjod-46-290-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f141/5033768/60730cf72a42/kjod-46-290-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f141/5033768/99ae42d1dd93/kjod-46-290-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f141/5033768/5f46b71aae50/kjod-46-290-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f141/5033768/0ead6a0a8ab7/kjod-46-290-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f141/5033768/617d326a1bba/kjod-46-290-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f141/5033768/1e85433a6e59/kjod-46-290-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f141/5033768/f4288a2a66a6/kjod-46-290-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f141/5033768/60730cf72a42/kjod-46-290-g007.jpg

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